The Mets outrighted Seelinger to Triple-A Syracuse on Saturday.
Seelinger will stick around in the Mets organization after going unclaimed off waivers when he was designated for assignment Wednesday. His stay on the Mets' 40-man roster lasted just one day, with Seelinger losing his spot after yielding seven earned runs in two innings of relief in his MLB debut during Tuesday's 16-12 loss to the Royals.